What symbol would indicate that an aircraft is both climbing and at a safe altitude?

The correct symbol that indicates an aircraft is both climbing and at a safe altitude is the Up Arrow. An Up Arrow specifically denotes an increase in altitude, which is a clear indication of climb. When this symbol appears in air traffic control communications or display screens, it confirms that the aircraft is ascending, and usually, it's understood that the altitude is within safe parameters, assuming no other conflicting information is present.

In aviation communication and indicator systems, different symbols convey specific meanings related to altitude status and direction. The Up Arrow is widely recognized among pilots and controllers as the standard representation for climbing, which aligns it with safety protocols when the altitude is being monitored.

Understanding the symbolism is critical in maintaining safe and efficient air traffic management, ensuring that all parties involved can quickly interpret the necessary information regarding an aircraft's altitude and trajectory.